Grinding and pulverizing apparatus



, Y Efrheatgf--Sh@etl 2. J. RUTHERFORD.

Grinding and'Pulverizng Apparatus.

N0.224,357 Paten'fedrebno,1880.

N.PETERS, FHOTO-LITHOGRAPMER, WASHXNGTON. D. CV

`l UNITED* PATENT' FFICE.

JOHN RUTHERFoaD, or SANY FRANcIsco, CALIFORNIA.,

e m-.N D l NG AN D PULvE RlzlN'e APPARATUS.

SPECIFICATION forming'lpart of VLetters Patent No."224,3`57, dated February 10, 1880.

Application med May 1, 1879.

- To all whom it may concern Be it'known that I-,1JoHNRU'rHERFoRm of the city and county of San FranciScm'Stat'e of' California, have invented an Improved Pnl# verizing-Barrel; and I do hereby declare the followin g to be a full, clear, and exact description thereof, reference beingV had 'to theaccomL panying drawings. Q

My invention has reference to thatclass of rotary barrel pulverizers inv whichores and" other substances are reduced to a powder or dust by means of balls, weights, or rollers placed loosely inside ofthe barrelwith the ore, so that when vthe barrel is'rotated` the ac# tion of the balls orweights upontheore willl Y crush and grind it to a line dust or powder( My invention consists, rst,`ina novel ar`j rangement for returning coarse particles from the periphery of the barrel tol the center for recrushing, and for discharging tothe outside' i of the barrel that portion which has `been suf-y flcently pulverized';` and, secondly, to anarLV rangement for supporting and driving the `bar-- rel, by which I apply the driving-power morejV economically, all as hereinafter more rfully de scribed.

Referring to the accompanying drawings,

. Figure l is an elevationand? section of 'my inlproved pulverizing-.barrel andl frame. Fig. 2'` shows a side View of the sama arms on the head of the barrel; and Fig. 4 is a lateral section of the barrel.

Ais a large barrel, the headsHH of which 'are made larger in diameter than the body or cylinder of the barrel. The periphery of leach of these heads is formed with a Vtread and a ilange 'similar to the periphery of a car-wheel,

so that they will bear'upon supporting-rollers,

as hereinafter more fully described. The in- Each stave is made thicker ononeedge than on the other, so that the floors are uneven or ribbed, by which means the balls, weights, or

Fig-3 is an. elevation, showing the disposition of radialy rollers will be kept continually changing their position as the doors rotate under them.

The spaces between thes-taves which form thai-nner iloor areA` wider thanv the spaces between the staves of theouteriloor.

The outside shell or cylinder, D, ofthe barrel is made slightly conical or tapering from one head of the barrel -to the other, for the purpose of directing all the crushed ore which passes through'the screen E to one end of the 1 barrel. y y' n The screenE'is arranged betweenthe outf side shell andthe outer crushing-door, B. This 'tscreen isf also conical, andI it is placed parallel 1 with then` outside shell, so that it will carry the particles of* ore that are too large to pass fthrough its Ameshes to the same end of the barrel that the ne particles which pass through it aredi-rected by the outside shell.v

The feediopenin g G is made through the center of thehead H,`to which the small end of the conical shell D is secured, sol that the ore is fed uponl the inner floor, C. After it has beenpulverized to Aa sucient fineness upon this `floor by the balls, weights, or rollers to permit -it to pass through the spaces between theslats or staves, it passes through to the outer orsecondloor, where it is'furt-her sub- Vjected to the action of the balla-weights, or

rollers-,andfl further reduced, so that it will .pass throug-h the spaces in this floor and be caught uponf the screen E. 4

'lhef conical form of the screen causes the particlesthat are too large to lpass through the meshes of the screen to tra-velE toward the head H of the barrel, while the finer particles .which pass through the screen are caught upon the outer shell, D, and are also carried toward the head H.

A disk,I, is secured to the outer edge of the ilange ofthe head H", so as to cover the entire space .inside of the flange and form a narrow chamber between the outer face of the head and thedisk. In the center of this disk his anopening, from which a discharge tube or spout, J, projects. The space between this disk and the face of the head H', I divide into two or more separate chambers by means of radial ribs or partitions K K. In the present instanceI have represented this space as being divided into six compartments, because IOO I shall usually employ that number. Every alternate compartment Z, I make tight at the end, near the center of the head, while the other compartments, l', lare open, and connect with the discharge tube or spout J. I then make an opening', m, through the head H', between the Outer door, B, and the screen E, so as to connect the space between them with the outer end of each compartment l, and another opening, n, to connect the inner end of each compartment with the central space in the barrel, so that the large particles of ore, which are carried by the inclined screen against the head H of the barrel, will pass out into these closed compartments through the openings m and fall to their inner ends,

where they will pass again through the openin gsn into the center of the barrel, to be again acted upon by the balls, weights, or rollers.

'I also make openings o through the head H', between the screen and Outer shell, D, so as to connect the space between the screen and shell with the compartments l l', through which the,iinely-pulverized Ore that passes through the screen will be conducted into the compart- Aments l', that connect with the discharge-spout J. By this arrangement all Of the particles that 'are too large to pass through the screen are automatically carried back and passed again through the pulverizer, while the fine particles are discharged through the spoutJ to the outside ot' the barrel.

As before stated, the heads of the barrel are provided with a ange and tread similar to that of a car-wheel, and the tread rests upon rollers. These rollers, p 12, are mounted in the ends of a semicircular supporting-frame, Q, so that the barrel rests upon a pair of rollers on each side of its center. The bearings of these rollers are elongated, and the journals are adjustable horizontally by means of a setscrew, r, so that they can be set to or from the bearing-edge of the heads, for the purpose hereinafter specified.

I drive the barrel by means of friction-rollers s s on the driving-shaft t.. This shaft eX- tends across the semicircular frame Q, directly underneath the barrel, and is supported in adj ustable boxes u. These boxes can be adj usted concentrically with the barrel in either direction by means of set-screws o v, as shown. This arrangement is of the utmost importance, as it enables me to adjust the drivingrollers so that they will connterbalance the weight of the balls, weights, or rollers in the barrel, as well as the charge of Ore.

By means of the set-screw, I can set the outside supporting-rollers, p, so as to throw more or less of the weight of the barrel on the driving-1'oller,and by adjusting the drivingshaft I can set the driving-rollers so that they will be directly under the load, and thus drive the barrel with a less amount of power than if the shaft were stationary. This arrangement can also be applied to amalgamating and other trundling barrels. .s

By these improvements I have greatly increased the crushing capacity of the pulverizing-barrel and reduced the power required to drive it. I can employ as many grindingoors as the diameter of the barrel will permit, and each additional licor will give the barrel additional pulverizin g capacity.

Having thus described my invention, what I claim, and desire to secure by Letters Patent, is-

1. In a pulverizing-barrel, the combination, with the inner inclined sieve, E, one or more concentric floors, B C, and the crushing-balls, of the inclined cylinder D, with its enlarged head, provided with ribs or partitions K K and a disk, I, which form tapering radial chambers l l and passages m n o, the passages m connecting the space inside of the sieve with the chamber l, communicating, through the passages u, with the central chamber of cylinder D, and passages o connecting the space exterior to the sieve with the chamber l', communicating with the discharge-tube J, as set forth.

2. In combination with a pulverizing-barrel, A, the adjustable supporting-rolls p p and the adjustable driving-rolls s s, substantially as and for the purpose described.

In witness whereof I have hereunto set my hand and seal.

JOHN RUTHERFORD.

Witnesses:

JNO. L. BOONE, W. FLOYD DUOKETT. 

